CN103091552A - Pre-calibrated electric energy metering circuit and calibration method - Google Patents
Pre-calibrated electric energy metering circuit and calibration method Download PDFInfo
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- CN103091552A CN103091552A CN2011103394904A CN201110339490A CN103091552A CN 103091552 A CN103091552 A CN 103091552A CN 2011103394904 A CN2011103394904 A CN 2011103394904A CN 201110339490 A CN201110339490 A CN 201110339490A CN 103091552 A CN103091552 A CN 103091552A
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Abstract
The invention discloses a pre-calibrated electric energy metering circuit and a calibration method. The pre-calibrated electric energy metering circuit and the calibration method which at least comprise a sampling module, an analog to digital conversion module, a digital signal processing module, a calibration register, an interface module and a calibration module, wherein the calibration register receives calibration data written in by a calibration control console through an interface to control a working state of the calibration module, and the calibration module controls the working state according to the set of the calibration register, and adjusts the transfer function of the modulator of the analog to digital conversion module. The pre-calibrated electric energy metering circuit and the calibration method can realize electric energy metering precision pre-calibration of an electric energy meter, simultaneously is compatible with peripheral circuits of an original electronic electric energy meter and a printed circuit board (PCB) is unnecessary to design afresh.
Description
Technical field
The present invention relates to the computation chip field, particularly relate to a kind of pre-calibrated electric energy metering circuit and calibration steps that is applied to ic for energy metering.
Background technology
Fig. 1 is existing a kind of ic for energy metering structural representation without calibration function.As shown in Figure 1, ic for energy metering without calibration function comprises sampling module, analog-to-digital conversion module, digital signal processing module, base modules and clock frequency modular converter, deliver to analog-to-digital conversion module after sampling module is sampled to current signal and voltage signal and carry out analog to digital conversion, current digital amount after conversion and voltage digital amount are sent into digital signal processing module and are processed, and generate measuring parameter.
Yet the measuring parameter that obtains through Fig. 1 is often inaccurate, and electronic electric energy meter generally all needs its measuring accuracy is calibrated, to satisfy the requirement of relevant Electric Energy Metering Technology codes and standards before dispatching from the factory.
At present, the calibration steps that electronic electric energy meter is commonly used mainly contains two kinds: hardware calibration and software calibration.
Hardware calibration is on electronic electric energy meter PCB uses plate, and voltage sample channels designs resistive divider network by short circuit divider network resistance, changes the line voltage attenuation sampled voltage of harmonizing, thereby realizes the calibration purpose.The hardware calibration method need to according to the suitable resistance of the manual short circuit of error condition, be regulated the speed slow; And the verification of resistance pressure-dividing network be limited in scope (be generally ± 30%), for the ic for energy metering that exceeds the verification scope, need the resistance in manual replacing, welding potential-divider network, increased hardware cost, also easily affect the precision of ammeter metering because of the rosin joint dry joint.
Software calibration is generally in ic for energy metering indoor design calibration register, writes calibration value by MCU to calibration register and realizes calibration.Existing software calibration method or technology have two classes; one class is before the line voltage/current signals is carried out analog to digital conversion; in advance simulating signal is carried out gain modulation; be the Chinese patent application of 03129510.X as Shanghai Hua Yuan microelectric technique company limited in the application number of application on June 26th, 2003; yet but this method need to design high-precision analog gain modulation amplifying circuit; design difficulty is large, and technical being not easy realized.
The another kind of of software calibration method is after the artificial line voltage/current signals is converted to digital quantity, and digital quantity is carried out gain-adjusted.The present electric energy metrical product majority with calibration function is according to said method realized.The method is applicable to the metering circuit with communication interface, needs redesign calibration register circuit, digital signal processing circuit, increases the digital circuit scale.When adopting the electric energy metrical product application of the method design, need by the external eeprom memory of communication interface; When calibration, calibration data stores outside eeprom memory into; When electric energy meter was used, calibration data was read from EEPROM, write calibration register by communication interface and realized calibration.Yet for the metering circuit without communication interface, often need to design the modules such as calibration register circuit, communication interface circuit and digital signal computing circuit, increase the communication pin, can't compatible original peripheral circuit, must the redesign pcb board, cost is high.
Summary of the invention
For overcoming the above-mentioned shortcoming of prior art, fundamental purpose of the present invention is to provide a kind of simple in structure, pre-calibrated electric energy metering circuit of need not to increase a large amount of circuit scales, it can fully compatible original electronic electric energy meter peripheral circuit, need not to redesign pcb board, simultaneously can effectively improve the electric energy meter measuring accuracy again, reduce the calibration cost.
For reaching above-mentioned and other purpose, the invention provides a kind of pre-calibrated electric energy metering circuit, at least comprise sampling module, analog-to-digital conversion module and digital signal processing module, in addition, this pre-calibrated electric energy metering circuit also comprises calibration register and interface module and calibration module, this calibration register receives the calibration data that writes of calibration control desk to control the duty of this calibration module by interface, this calibration module arranges the control duty according to this calibration register, and the modulator transition function of this analog-to-digital conversion module is adjusted.
Further, this analog-to-digital conversion module is realized by Sigma-Delta ADC.
Further, this Sigma-Delta ADC is second order Sigma-Delta ADC, and it comprises the feedback loop of integrator, comparer and digital to analog converter at least.
Further, this calibration register is the Nonvolatile programmable unit, and it realizes DLL (dynamic link library) by multiplexing pins, as the interface circuit of this calibration register and interface module.
Further, when detection calibration, multiplexing pins is used for this calibration register of programming; During normal operation, this calibration register value remains unchanged, and multiplexing pins is normally used.
Further, if this ic for energy metering is the ic for energy metering with communication interface, adopt the internal register circuit as this calibration register, the interface circuit of this calibration register and interface module and this communication interface are multiplexing, this calibration data is temporary to outside eeprom memory, then writes this calibration register by this communication interface.
Further, the bit wide of this calibration register is determined by the calibration range of this calibration module.
Further, this ic for energy metering also comprises base modules and clock frequency modular converter, and this base modules is for generation of the required reference voltage signal of this ic for energy metering work, and provides reference voltage for this sampling module and this analog-to-digital conversion module; This clock and frequency translation module provide clock signal and output pulse frequency reference signal for this sampling module, this analog-to-digital conversion module and this digital signal processing module.
For reaching above-mentioned and other purpose, the present invention also provides a kind of calibration steps of pre-calibrated electric energy metering circuit, comprises the steps:
Step 1, this ic for energy metering output electric parameter metering result is given the calibration control desk;
Step 2, this calibration control desk calculates preliminary survey error amount and compensation for calibrating errors data according to this electric parameter metering result;
Step 3 according to these compensation for calibrating errors data, calculates the modulator coefficient range that will compensate the required adjustment of this error amount;
Step 4 draws the duty of calibration module according to the modulator coefficient range of need adjustment, and obtains corresponding calibration register value;
Step 5 writes calibration register with calibration data, controls this calibration module and is operated in the state that step 4 draws; And
Step 6, this ic for energy metering are again measured and are exported new electric parameter metering result and calibrate control desk to this.
Further, comprise the steps: also after step 6 that this calibration control desk judges whether error in dipping meets the requirements, if meet, completes calibration; If do not meet, repeating step two is to the process of step 6.
Compared with prior art, a kind of pre-calibrated electric energy metering circuit of the present invention and calibration steps are controlled calibration module by calibration register is set, modulator transition function coefficient to analog-to-digital conversion module carries out trim process, the size of digital quantity after the change simulating signal is changed through analog-to-digital conversion module, thereby the function that realization is calibrated the ic for energy metering measuring accuracy; The calibration structure of the present invention's pre-calibrated electric energy metering circuit is simple, need not to increase a large amount of circuit scales, complete compatible original electronic electric energy meter peripheral circuit during application, need not to redesign pcb board, simultaneously can effectively improve the electric energy meter measuring accuracy again, having reduced the calibration cost, is the selection of the high efficient and flexible in electric energy computation chip field.
Description of drawings
Fig. 1 is existing a kind of ic for energy metering structural representation without calibration function;
Fig. 2 is the circuit structure block diagram of the preferred embodiment of a kind of pre-calibrated electric energy metering circuit of the present invention;
Fig. 3 is a kind of example structure schematic diagram of analog-to-digital conversion module modulator in the present invention;
Fig. 4 is that the calibration of the present invention's pre-calibrated electric energy metering circuit is used block diagram;
The flow chart of steps of the calibration steps of Fig. 5 the present invention's pre-calibrated electric energy metering circuit.
Embodiment
Below by specific instantiation and accompanying drawings embodiments of the present invention, those skilled in the art can understand other advantage of the present invention and effect easily by content disclosed in the present specification.The present invention also can be implemented or be used by other different instantiation, and the every details in this instructions also can be based on different viewpoints and application, carries out various modifications and change under spirit of the present invention not deviating from.
Fig. 2 is the circuit structure block diagram of the preferred embodiment of a kind of pre-calibrated electric energy metering circuit of the present invention.As shown in Figure 2, a kind of pre-calibrated electric energy metering circuit of the present invention comprises sampling module 201, analog-to-digital conversion module 202, digital signal processing module 203, calibration register and interface module 204, calibration module 205, base modules 206 and clock frequency modular converter 207 at least.
Wherein, sampling module 201 is used for sample rate current signal and line voltage signal, supplies with analog-to-digital conversion module 202 (ADC) and processes; Analog-to-digital conversion module 202, the current signal of sampling module 201 samplings and line voltage signal are converted to corresponding current signal digital quantity and voltage signal digital quantity, process for digital signal processing module 203, due to the measuring accuracy requirement, general analog-to-digital conversion module is realized by Sigma-Delta ADC; Digital signal processing module 203 carries out filtering to current signal digital quantity and voltage signal digital quantity and processes the row operation of going forward side by side, and calculates the instantaneous power value, and the instantaneous power value is cumulative obtains the electric energy metrical value, exports to outside MCU (not shown) and processes; Calibration register and interface module 204 can write to calibration register the duty that calibration value is controlled calibration module 205 by interface, and the bit wide of calibration register is determined by the calibration range of calibration module 205; Calibration module 205, according to calibration register the control duty is set, directly to the inching of running business into particular one of the modulator transition function coefficient of analog-to-digital conversion module 202; Base modules 206 for generation of the required reference voltage signal of circuit working, and provides reference voltage for sampling module 201 and analog-to-digital conversion module 202; Clock and frequency translation module 207 are for sampling module 201, analog-to-digital conversion module 202, digital signal processing module 203 etc. provide clock signal and output pulse frequency reference signal.
Fig. 3 is a kind of example structure schematic diagram of analog-to-digital conversion module modulator in the present invention, and as shown in Figure 3, analog-to-digital conversion module 202 is the Sigma-Delta modulator of second order, and Vin is analog input, and Dout is digital output.
The Sigma-Delta modulator is sampled to the input simulating signal with high sampling frequency, and the difference between two sampling is carried out low bit quantification, thereby obtains the digital signal with the lower-order digit representation, i.e. ∑-Δ code; Then this code is delivered to decimation filter of digital and carry out filtering extraction, obtain the digital signal of high-resolution Linear Pulse Code Modulation, its structure proximate is in dual slope A-D converter, except the gain amplifier section, the feedback loop that also comprises integrator, comparer and digital to analog converter (DAC), because the structure of Sigma-Delta modulator is prior art, do not repeat them here.What need further illustrate is, for the signal that makes different amplitudes through the Sigma-Delta modulators modulate after the linearity be consistent, calibration module is to the feedback factor b1 of the Sigma-Delta modulator inching of running business into particular one.
In preferred embodiment of the present invention, for the ic for energy metering without communication interface, can adopt the Nonvolatile programmable unit as calibration register, pin multiplexing is realized DLL (dynamic link library).When detection calibration, multiplexing pins is used for the programming calibration register; During normal operation, the calibration register value remains unchanged, multiplexing pins is normally used, fully compatible original electronic electric energy meter peripheral circuit and pcb board, and the Nonvolatile programmable unit that adopts here can be fuse, the nonvolatile semiconductor memory members such as OTP ROM, EEPROM; And for the metering circuit with communication interface, calibration register can adopt the Nonvolatile programmable cellular construction, as previously described, perhaps also can adopt the internal register circuit as calibration register, interface circuit is multiplexing with original communication interface, calibration data is temporary to outside eeprom memory, writes calibration register by communication interface and realizes calibration, fully compatible original electronic electric energy meter peripheral circuit and pcb board.
It should be noted that at this, corresponding to processing single-phase multi channel currents and voltage signal, perhaps three-phase current and voltage signal, the present invention's the ic for energy metering with measuring accuracy pre-calibration function is respectively single-phase electric energy metering circuit or three-phase electric energy metering circuit.
Fig. 4 is that the calibration of the present invention's pre-calibrated electric energy metering circuit is used block diagram, the flow chart of steps of the calibration steps of Fig. 5 the present invention's pre-calibrated electric energy metering circuit.Below will coordinate Fig. 4 and Fig. 5 to further illustrate the calibration steps of the present invention's pre-calibrated electric energy metering circuit, the method step is as follows:
From the above, due to no matter be the hardware calibration method, or the software calibration method, the calibration of measuring accuracy is realized by adjusting signal amplitude after all.Simulating signal is converted to the size of digital quantity through analog-to-digital conversion module, directly the modulator with analog-to-digital conversion module is relevant, by the coefficient of fine setting modulator transition function, just can realize the purpose that the ic for energy metering measuring accuracy is calibrated so.Just be based on above-mentioned thinking, the present invention proposes a kind of ic for energy metering and calibration steps with measuring accuracy pre-calibration function, it can realize the pre-calibration of electric energy measurement precision, and compatible original electronic electric energy meter peripheral circuit, need not to redesign pcb board simultaneously.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not is used for restriction the present invention.Any those skilled in the art all can under spirit of the present invention and category, modify and change above-described embodiment.Therefore, the scope of the present invention should be as listed in claims.
Claims (10)
1. pre-calibrated electric energy metering circuit, at least comprise sampling module, analog-to-digital conversion module and digital signal processing module, it is characterized in that: this pre-calibrated electric energy metering circuit also comprises calibration register and interface module and calibration module, this calibration register receives the calibration data that writes of calibration control desk to control the duty of this calibration module by interface, this calibration module arranges the control duty according to this calibration register, and the modulator transition function of this analog-to-digital conversion module is adjusted.
2. pre-calibrated electric energy metering circuit as claimed in claim 1, it is characterized in that: this analog-to-digital conversion module is realized by Sigma-Delta ADC.
3. pre-calibrated electric energy metering circuit as claimed in claim 2, it is characterized in that: this Sigma-Delta ADC is second order Sigma-Delta ADC, and it comprises the feedback loop of integrator, comparer and digital to analog converter at least.
4. pre-calibrated electric energy metering circuit as claimed in claim 1, it is characterized in that: this calibration register is the Nonvolatile programmable unit, and it realizes DLL (dynamic link library) by multiplexing pins, as the interface circuit of this calibration register and interface module.
5. pre-calibrated electric energy metering circuit as claimed in claim 4 is characterized in that: when detection calibration, multiplexing pins is used for this calibration register of programming; During normal operation, this calibration register value remains unchanged, and multiplexing pins is normally used.
6. pre-calibrated electric energy metering circuit as claimed in claim 1, it is characterized in that: if this ic for energy metering is the ic for energy metering with communication interface, adopt the internal register circuit as this calibration register, the interface circuit of this calibration register and interface module and this communication interface are multiplexing, this calibration data is temporary to outside eeprom memory, then writes this calibration register by this communication interface.
7. pre-calibrated electric energy metering circuit as claimed in claim 1 is characterized in that: the bit wide of this calibration register is determined by the calibration range of this calibration module.
8. pre-calibrated electric energy metering circuit as claimed in claim 1, it is characterized in that: this ic for energy metering also comprises base modules and clock frequency modular converter, this base modules is for generation of the required reference voltage signal of this ic for energy metering work, and provides reference voltage for this sampling module and this analog-to-digital conversion module; This clock and frequency translation module provide clock signal and output pulse frequency reference signal for this sampling module, this analog-to-digital conversion module and this digital signal processing module.
9. the calibration steps of a pre-calibrated electric energy metering circuit, comprise the steps:
Step 1, this ic for energy metering output electric parameter metering result is given the calibration control desk;
Step 2, this calibration control desk calculates preliminary survey error amount and compensation for calibrating errors data according to this electric parameter metering result;
Step 3 according to these compensation for calibrating errors data, calculates the modulator coefficient range that will compensate the required adjustment of this error amount;
Step 4 draws the duty of calibration module according to the modulator coefficient range of need adjustment, and obtains corresponding calibration register value;
Step 5 writes calibration register with calibration data, controls this calibration module and is operated in the state that step 4 draws; And
Step 6, this ic for energy metering are again measured and are exported new electric parameter metering result and calibrate control desk to this.
10. the calibration steps of pre-calibrated electric energy metering circuit as claimed in claim 9, is characterized in that, also comprises the steps: after step 6
This calibration control desk judges whether error in dipping meets the requirements;
If meet, complete calibration; If do not meet, repeating step two is to the process of step 6.
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| CN104280606A (en) * | 2014-10-10 | 2015-01-14 | 华立仪表集团股份有限公司 | Self-starting method and parameter self-calibration method of metering chip |
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| CN105717473A (en) * | 2014-12-19 | 2016-06-29 | 基思利仪器公司 | Method for self calibration of measurement nonlinearity |
| CN105738692A (en) * | 2014-12-11 | 2016-07-06 | 苏州工业园区新宏博通讯科技有限公司 | Electric energy meter and debugging method thereof |
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| CN110988782A (en) * | 2019-12-19 | 2020-04-10 | 上海贝岭股份有限公司 | Calibration circuit and system, electric energy metering chip and metering device |
| CN111060863A (en) * | 2019-12-29 | 2020-04-24 | 合肥工大高科信息科技股份有限公司 | Automatic calibration method and system for micro-electronic receiver of track circuit |
| CN111060863B (en) * | 2019-12-29 | 2022-05-03 | 合肥工大高科信息科技股份有限公司 | Automatic calibration method and system for micro-electronic receiver of track circuit |
| CN112148064A (en) * | 2020-11-24 | 2020-12-29 | 杭州晶华微电子有限公司 | Semiconductor chip and control method thereof |
| CN112148064B (en) * | 2020-11-24 | 2021-02-12 | 杭州晶华微电子有限公司 | Semiconductor chip and control method thereof |
| CN112600558A (en) * | 2020-12-22 | 2021-04-02 | 江苏金帆电源科技有限公司 | Analog-to-digital conversion linearity correction method and device |
| CN113552529A (en) * | 2021-07-30 | 2021-10-26 | 国网山东省电力公司德州供电公司 | Self-calibration system and method based on intelligent electric energy meter online monitoring |
| CN113866705A (en) * | 2021-08-27 | 2021-12-31 | 威胜集团有限公司 | Harmonic correction method and device, electric energy metering equipment and readable storage medium |
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